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Abstract: Our understanding of the chemical composition of outdoor and indoor atmosphere, spatiotemporal variability of pollution sources, chemical exposures, and their effects on human health is limited by the lack of chemically speciated and spatially resolved ambient measurements. This seminar presents novel real-time measurements of volatile organic compounds (VOCs) aboard a “sniff-mobile” lab enabling spatiotemporal evaluation of pollution hotspots and quantification of community exposure to conventional and emerging air pollutants. We used a Vocus 2R proton transfer reaction time-of-flight mass spectrometry (Vocus-PTR-ToF-MS) which offers a sub-part-per-trillion detection limit (sub-ppt) to map out spatiotemporal distribution of hundreds of gas-phase chemicals including air toxics at the community level in different regions of Texas, focusing on anthropogenic and biogenic sources. The pilot data show potential for regional source apportionment of pollutants and offer a new approach to quantify community exposure to adverse air quality at neighborhood scales. Direct laboratory measurements of chemical source fingerprinting are also discussed.

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Sciences Building (SCI), 1.210
800 W. Campbell Road, Richardson, Texas 75080-3021

Natural Sciences & Mathematics
Dr. Hedieh Torabifard
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